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Monorepo for the Firebase JavaScript SDK
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[Home](./index.md) > [@firebase/auth-types](./auth-types.md) > [UserCredential](./auth-types.usercredential.md) > [providerId](./auth-types.usercredential.providerid.md)
## UserCredential.providerId property
The provider which was used to authenticate the user.
<b>Signature:</b>
```typescript
providerId: string | null;
```